 Volcanic ash from the eruption was carried across most of the Pacific Northwest as well as parts of southern Canada.About 13,000 years ago, Glacier Peak generated an unusually strong sequence of eruptions depositing volcanic ash as far away as Wyoming.Most of the Silverthrone Caldera's eruptions in the Pacific Range occurred during the last ice age and was episodically active during both Pemberton and Garibaldi Volcanic Belt stages of volcanism.